Pull-socket for incandescent lamps.



H. T. PAISTE.

PULL SOCKET FOR INGANDESOENT LAMPS.

APPLICATION FILED MAR. 18, 1908.

Patented Jan. 11, 1910.

W 3% [Z%fiv*0 fifM/W- some n. rars'rn, or PHILADELI: a, 'rn'ivnsvrivama.

roLL-soc'r ron rncannrscsur Lanes.

Specification ofLettersPatent. e eem J 11, ow,

.dpplicatton filed march 18, 1998. Serial no. 421,779.

- To all whom it may concern:

Be it known that l, HENRY T. Pars'rn, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain improvements in Pull-Sockets for Incandescent Lamps, of which the followingis a specification.v

My invention relates-to that particular class of sockets for incandescent electric lamps in which there is provided a switch,

having in place of the ordinary hand operated key, a chain or equivalent operating member and mechanism whereby the switch is alternately turned on and oh by a succession of pulls on said member.

One object of myinvention is to provide a. socket of the above noted class, which in addition to being substantial in construcclan and relatively simple as to the number and form oi its parts, shall have these latso arranged that thelialoility of the de vice "failing to iroperly operate from any cause shall he re need to a minimum.

Another object of the invention is to provide a form of rotary switch articularly adapted for use within an incand scent lamp socket or the usual size and which shall be capable oi operation by a suitable pull cX- erted upon a chain or other flexible member depending from and extending into the socket; it being also desired that the parts shall be so arranged and constructed as to operate easily and practically noiselessly.

Theseand other advantageous ends 1 secure as hereinafter set forth, reference being had to the accompanying dras, in-

Figure 1, is a side elevation of a lamp socket constructed according to my invention; Figs. 2 and 3, are vertical longitudinal sections of the socket shown in Fig. 1, taken ,in two planes at right angles to each other;

Fig. i, is a side elevation illustrating the interior construction oi the socket, the outside casing being removed; Figs. 5 and 6, are respectively a transverse vertical section taken on the lines 5-5 and M, Fig. 3; Figs. 7 to 10 inclusive are detached perspective views of various detail parts of my invention, and Fig. 11, is an enlarged end elevation of the contact head and its associated contact plate. v

In the above drawings A represents the main portion of the casing oi the soclret which has also a cover or end section A. Within this main portion is a lining of: in-

'b and b.

sulating material made in two sections a and a, in the present instance the latter of these being in a portion of said casing smaller in diameter than the remainder.

Contained in the casing is the frame or supporting structure of the socket which consists of two disks B and B of insulating material, usually porcelain, rigidly connected and held together by twometallic ieces In addition there is rigidly mounted upon the disk B a metallic shell I) which in the resent instance is threaded, as the socket illustrated is of the Edison type. The shell is held in place by a screw if whose head engages a washer Fr which in turn causes an insulating washer b to be tightly held in engagement with an inwardly projecting flange 01" said shell. Theinner end of the screw'o passes through the insulating dish ll into a suitably threaded opening in a contact plate 5) on the opposite lace or said dish and serves to hold said platein position. The shell (3 has electrically connected to its projecting lug or plate 6 provided with a terminal screw 5 which constitutes one of the terminals of the plug. The piece 6 connecting the two disks B and B has mounted in it a screw 11 which con stitutes the second terminal or" the plug, and in addition said piece, together with a U- shaped piece cmounted upon the disk B, provides sup orting bearings for a shaft or spindle c. aid piece a isheld in place by a screw 0 which also engages a scmi-annular strip a mounted in a recess in the upper face of the disk B. Said piece is also connected by a screw 0 to the terminal piece 3.

Fixed to the shaft or spindle c is a contact head 0 and trom Fig. 9 it will be seen that this consists of two elongated pieces of fiat metal, which as shown in Fig. 11, have their ends curved concentrically with the shaft or spindle c and l also-round that corner at each end which first'strikes the contact plate I) when said head is'turned. The contact plate aforesaid is also curved from the same radius as that of the ends of the contact head so that when the latter engages said plate the area of the contact between them is relatively great. Between the contact head a and the disk B there is mounted upon the U-shaped piece 0 a spiral spring 0 whi h continually presses a fiat washers tow rd said head 0 Upon the central portion of the spindle c ls-n'oni 948,3at

in material such as fiber and on each side or this is loosely mounted a plate d also of' insulatin material, which plates are rigidly connects together by a pin as shown in t Fig. 8. Upon this pin is placed a pawl E, preferably made of a stifi metal strip shaped as shown in Fig. 10, so as to have a tooth e capable of engaging the teeth of the ratchet wheel. It also has one end e forked or c divided for the reception oil the end member of the chain F, and this chain rests upon the ratchet wheel and is kept in placethereon by the side plates (2. Also placed upon the shaft or spindle a is a spiral s ring 0 having one end fastened to or resting upon the metallic iece b and its other end fastened to one o the side members d, the arrangementbeing such that the spring continually tends to hold the two side members in or return them to a position in which the chain F is wound somewhat more than one-quarter way around the ratchet wheel D. lln order to revent undue revolution of these side menu ers ti and consequently of the ratchet wheel, when tension is exerted on the chain, I extend the edges of said members as indicated at d", so that when they have been given a quarter of a revolution these extensions strike the flat face of the disk B and prevent further revolution of the ratchet wheel.

The chain, as shown in Fig. 2, extends from the pawl E over the ratchet Wheel, between the two disks d and out through an opening in the side of the main portion of the casin A, which opening is provided with a be mounted bushing a. Under conditions of use the current supply wires enter the cap A and after passing through suitas able grooves 03 and ac in the edge of the insulating disk B, are respectively connected to the pieces I) and 5.

ll, when the switch is in a closed position, the circuit through the socket be :tollowed as out, it will be seen that current is free to pass from the piece Z) to the threaded shell b thence through the lamp which is screwed into the socket and back to the center ter minal formed by the screw b and the so washer or plate I): From said screw it then passes to the contact plate 6, through the contact head a ti -shaped piece 0, screw 0 semi-annular race a, through screw 0* to the piece I) an thence to the second current supply conductor; it being also possible that some current I asses direct :i'rom the head 0 to said iece In or er to open the switch, tension is en erted upon the chain F with the result that so the tooth e of the pawl E is made to engage a tooth of the ratchet wheel ll) so that it, with the shaft or s indie o, is turned through 90; its tort er movement being prevented by the projections ti ol' the side as plates d. its a consequence the contact c is turned to a position out of engagement with the contact plate a and is held 1n said disengaged position by means of the pressure of the spring 0 u on the washer c which engages its fiat si e. As soon as tension is removed from the chain F, the spring a at once acts to return the two side plates d with the pawl E to the position shown in Fig. 2, and inasmuch as the ratchet wheel is provided with four teeth, successive pulls upon said chain alternately cause closing and opcnin of the switch and making and breaking or the circuit through the socket.

It will be noted that owing to the mounting and construction of the pawl E, its en- 30 gagement with the teeth of the ratchet Wheel is assured without the necessity for a spring to force it into engagement therewith, because of the fact that any tension exerted upon the chain at once draws its tooth e toward the said ratchet wheel. Again, it will be noted that the various current-carrying structures of the plug are so placed as to be out of the vicinity ot the metallic chain, which engages only those parts formed of insulating material, so that the likelihood of damage from short circuits or from contact between the chain and a current carrying member is reduced to a minimum.

By reason of the peculiar construction of the contact head and its curved contact plate I), said head, which is always turned in the direction of the arrow Fig. 11, comes into gradual engagement with said plate, obviating in a great measure the clicking or jar ordinarily occurring and promoting a smooth action of the parts. Again, heating otthe' parts is prevented by the large area of contact between the head a and the contact plate I).

lt will be noted that the parts of the device are of a substantial construction, so that the probability of failure of the plug under the most severe tests of operation is reduced to a minimum.

I claim:

1. The combination in a pull socket of a receptacle for an incandescent lamp, a switch in circuit with a terminal of said receptacle. including a shaft, a contact head mounted thereon, a contact member placed to be engaged by the head, .a supporting structure loosely rotatable onthe shaft as an axis, a pawl pivoted to said structure, a flexible operating member connected to said pawl and means for guiding said operating member to causeit to draw said pawl inwardly toward the center of the ratchet wheel.

2. The combination in a pull socket oil a 125 receptacle for an incandescent lamp, a switch in ci cult with a terminal of said receptacle, said switch including a shaft, a. contact head mounted thereon, a contact member placed to be engaged toy the head, no

a ratchet wheel on the shaft, a pawl. a sup-"- porting structure carrying said pawl and rotatable on the shaft as an axis, wlth a pawl and partly wound on a ratchet wheel, said pawl having a portion extending in wardl'y toward the center of said wheel.

A socket switch consisting of a supporting structure, two terminals, and a switch connected between said terminals, said switch including a revoluble shaft, a contact head thereon. a ratchet wheel of insulating matemounted on said supporting structure, and

operating means capable of moving the supporting structure and of simultaneously flexible operatlng member connected to said rial fixed to the shaft, a plate or plates also of insulating material and loosely rotatable on the shaft as an axis, a pawl pivotallv ca r ried' by said plate orplates, a flexibleoperat- 1 ing member connected to. the pawl; and a," spring tending to oppose mo e nent of the" pawl. and. said operating member 4."). socket switch iucl'udii structure". terminals mounted oluble vshaft having .a cent: ratchet wheel fixed to-t-hesh ii'i said ratchetwvheel havi'ngs ppor loosely rotatable on t'he' shaft as an axi Y said pawl being pivoted tothe supporting means at one side of the ratchet ivheell, an operating member connected .to said awl so means thattension upon said membertends 'to'turn the pawl on its pivot into engagement with the teeth of the ratchet wheel. and *means tending to oppose movement ofthepaivl un der the action of the, operating means.

The combination of a. lamp socket with a base structure:having a switch in circuit the action of the operating member.

6. A pull socket having a supporting structure, a switch provided with operating means including a rotatable shaft, a ratch t wheel fixed to said shaft, and a supporting structure consisting of'two rigidly connected plates mounted on the shaft on opposite sides of the ratchet wheel, a pawl pivotally drawing the pawltoward the ratchet wheel, said pawl supporting plates having a pro jectiig shoulder or shoulders constructed to engage the switch supporting structure after they have been turned a predetermined distance upon the shaft.

7. The combination in a pull socket, of two disks of insulating material having .a connecting'structui a shaft rotatably mounted between said disks. a switch having oneof its.mernbers operatively connected to said shaft, a ratchet wheel of insulating material fixed to the shaft, a plate of insulating Jina- .teri'al rotatably mounted on the -shaft on each side of said ratchet. wheel, each plate. -beiingprorided with a projection. a pin con- ;neeting said platespa-pawl on said pin, a .llexible. operating member conuected to the .paivl, and aspring connected to oppose movement of the said insulating plates, the pro- S.:. f\ pull socket having a supporting structure, a switch provided with operating means, said means including a rotatable shaft, a ratchet wheel, a pawl formed of an s shaped piece, supporting means, and an operating member engaging one end of the pawl so as to draw the other end into en- 5 gagement with the teeth of the ratchet. with a ternunal of said socket,- said switch;

"9 The combination in a pull socket of a supportingstructure. a switch carried thereby. and operating means for said switch.

said means including a rotatable shaft, a

. ratchet'whcel fixed thereto, a pawl support- HENRY T. PAISTE. \Vitnesses:

WM. A. BARR,

Jos. H. KLEIN.

ectious of the plates being placed to engage one of the insulating disks after said-plate has been turned about sa id shaft a predetermiued di tance by the operating member. 

